Man Lā Yaḥḍuruh al-Faqīh #748"In the case of a missing person (mafqud), his wealth is withheld for four years, and then it is divided."
Al-Kāfi #480“Abu ‘Abd Allah (a.s.), has said, ‘The heirs must keep the assets of one who is lost for the duration of four years’ searching. If he is not...